on new year's eve, we do that in a very controlled environment. but in a marathon, we have 26 miles. >> brian: it's impossible, isn't it? >> steve: everybody has one. >> brian: but you can secure the finish line, or major points, the start or finish. do you feel confident about that? >> well, it depends. it's a big open area. you have thousands of people who are running. they're bringing their own clothing. usually what happens is they'll take some -- whatever they wear to the start of the race. they'll take that, put it in the vehicle. it's transported to the finish line. it's difficult to control. there is no easy answers, no guarantees, that's for sure. >> gretchen: when this first happened, i think a lot of people thought about new york city and 9-11, of course. but one of the things i thought a lot about was all the attacks that you thwarted. so how do you continue to be so successful at that, because there is so much discussion about it only takes one. >> right. they only have to be successful once. >> gretchen: how do you continue to be suc